Your glasses fog over three times in less than 5km! I gave up in the end and took them off.

Also, you might be an idiot if you get almost to work, check behind (no traffic visible) then move over for a right hand turn and decide to double check your blinky is flashing bright and strong, only to discover that it's illuminating your rear brake because you neglected to properly tighten a screw At least no one drove over me from behind

"...for many people your life is not worth the effort it takes to pay attention or the extra few seconds they may need to wait before they can safely get around you."-BikeSnobNYC

More often I find that the mounting supplied with many cheap lights are absolute rubbish. I use cable ties to attach them to the bicycle instead. 10 cents worth of cable ties more effective than the mounting I just paid $20 for. Says a-lot about budget gear.